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Assessment of biofertilizer quality and health implications of anaerobic digestion effluent of cow dung and chicken droppings

Author

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  • Alfa, M.I.
  • Adie, D.B.
  • Igboro, S.B.
  • Oranusi, U.S.
  • Dahunsi, S.O.
  • Akali, D.M.

Abstract

Anaerobic digestate have been identified as a rich source of essential plant nutrients. Nevertheless, its safety measured by the concentration of pathogen present is of great concern to end users. This research explored the efficiency of the mesophilic biodigestion process in the stabilization and sanitization of cow dung and chicken droppings. Six (6) kg each of cow dung and chicken droppings were collected fresh and free from impurities, pre-fermented, mixed with water in the ratio 1:1 w/v to form slurry, fed into the respective reactors and digested for 30 days at an average ambient temperature of 30 ± 2 °C. The pH of the medium fluctuated between 6.5 and 8.0. The analysis of the feedstock and effluent of the digesters showed that a total solids reduction of 75.3% and 60.1% were recorded for cow dung and chicken droppings while the reduction in total coliforms was 95% and 70% respectively for the dung and droppings. Microbial analysis of the biofertilizer produced reveals both aerobic and anaerobic organisms which include species of Pseudomonas, Klebsiella, Clostridium, Bacillus, Bacteroides, Salmonella, Penicillum and Aspergillus. Escherichia coli and Shigella spp. were removed while species of Salmonella and Klebsiella were still present in the digestate. Notwithstanding these results, the digestate still requires further treatment for it to be suitable for application on unrestricted crops either as fertilizer; otherwise a health problem would be created as attempt is made to improve soil fertility.

Suggested Citation

  • Alfa, M.I. & Adie, D.B. & Igboro, S.B. & Oranusi, U.S. & Dahunsi, S.O. & Akali, D.M., 2014. "Assessment of biofertilizer quality and health implications of anaerobic digestion effluent of cow dung and chicken droppings," Renewable Energy, Elsevier, vol. 63(C), pages 681-686.
    • Handle: RePEc:eee:renene:v:63:y:2014:i:c:p:681-686
    DOI: 10.1016/j.renene.2013.09.049
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    Cited by:

    1. Fang, Hongli & Shi, Yongsen & Li, Dunjie & Song, Liuying & Li, Yu-You & Liu, Rutao & Yuan, Dong & Niu, Qigui, 2020. "Synergistic co-digestion of waste commercial yeast and chicken manure: Kinetic simulation, DOM variation and microbial community assessment," Renewable Energy, Elsevier, vol. 162(C), pages 2272-2284.
    2. Kit Wayne Chew & Shir Reen Chia & Hong-Wei Yen & Saifuddin Nomanbhay & Yeek-Chia Ho & Pau Loke Show, 2019. "Transformation of Biomass Waste into Sustainable Organic Fertilizers," Sustainability, MDPI, vol. 11(8), pages 1-19, April.
    3. Daniel Ddiba & Kim Andersson & Arno Rosemarin & Helfrid Schulte-Herbrüggen & Sarah Dickin, 2022. "The circular economy potential of urban organic waste streams in low- and middle-income countries," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 24(1), pages 1116-1144, January.
    4. Şenol, Halil & Ali Dereli̇, Mehmet & Özbilgin, Ferdi, 2021. "Investigation of the distribution of bovine manure-based biomethane potential using an artificial neural network in Turkey to 2030," Renewable and Sustainable Energy Reviews, Elsevier, vol. 149(C).

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